Loud-speaker unit



Aprila,19:28.l A 1,664,448

P. AMATO LOUD SPEAKER UNIT Filed may 5. 192s n 2 Sheets-Shen 2 Invemfor 20; ffm/afi Patented Apr.' 3, 192s.

vPATENT OFFI-CE.'

PETER AMATO, 0F LYNN, MASSACHUSETTS.

LOUD-SPEAKER UNIT.

Application 1ed May 5,

This invention relates to new improvements in sound reproducing apparatus, and particularly to an electrically operated loud speaker unit.

'This invention comprehends the provision of a new principle of construction and operation ot' a loud speaker unit in order to eliminate the numerous disadvantages inherent in'loud speaker units, now known to the art, resulting from the mechanical construction and association of the parts.

1t is an object ot this invention to provide a loud speaker unit wherein a sound reproducing plate member is freely supported for uniform reciprocating movement on its axis iii order to move a column of aii to produce sound waves corresponding to the vibratory reciprocation of'this reproducing member.

A further obJect oit the invention resides in providing a loud speaker unit for reprodueing sound waves including a vibratory armature adapted to he vibrated by suitable electro-magnetic means having a single support extending laterally relative to the axis,

ot' movement of the arniatui'e with a sound reproducing member directly and axially connected with the armature.

A further feature of the invention resides in providing means for varying the relation between the sound reproducing assembly and the. operating structure therefor, in order that the volume of the reed production may be directly controlled. y

rl`he invention comprehends numerous other objects residing in the method of constructing and mounting the reproducing structure oi' assembly and the operating unit therefor, which are more particularly pointed out in the :following detailed description, and in the claim directed to a preferred form of construction, it being understood, however, that various changes in the size, shape, and arrangement of the parts may be made without departing from the spirit and scope of the invention as herein set forth.

In the drawings forming part of this application: n

Figure 1 is a rear elevational view of the assembled reproducer.

Fig. 2 is a vertical transverse section thru the reproducer as shown in Fig. 1,

Fig. 3 is a side elevation of the ,assembled reproducing and operating units therefor,

Fig. 4 lis a horizontal sectional view taken on the line 4-4of Fig. 3, showing the strue- 1926. Serial N0. 106,912.

ture ot' the operating unit and the armature ofjtlie reproducing assembly.

Fig. 5 isa front elevation of the construction shown in Fig. 4, showing the armature construction and mounting for the reproducing assembly in its associated relation with the operating structure.

A suitable fork or standard is indicated at 1 which carries at its upper end a cylindrical housing 2 provided with an open forward end having the annular iange 3 extending therefrom.

The sound reproducing assembly includes the armature 4 which includes the vibratory sect-ion 5 connected by a narrow strip portion G with the supportnig plate portion 7 forming the single support for the entire sound reproducing assembly which is mounted by suitable means indicated at 8 on the flange 3 of the housing 2. A suitable axis rod 9 is secured at one end to the center of the vibrator section 5 of the armature as clearly shown in F ig. 5, while the opposite end extending in axial relation with respect to the axis otI movement of the vihratory section 5 carries the reproducing member 10. This reproducing member 10 includes a frame work 11 composed of a plurality ot. radiallyextending bars 12 formed with tapered inner end portions at 13, having these tapered spaces in intimate contact and securely assembledv relation in forming a unitary and substantially rigid frame construction.

The bars 12 are ot substantially uniform width throughout their length beyond the tapered ends 13,- while in thickness they vary as more clearly shown in-Fig. 2, from the` inner ends at 18 which are of greater thicknessto the outer end indicated at 14 which are of minimum thickness. A reproducing plate member 15 oi suitable cheap material is applied to one face of the frame structure as shown in Fig. 2, which lies within a iiorfV mally plane surface While the variation in thickness of the members 12 is provided for on the opposite face of the frame structure. After the application of the reproducing plate member l5, to the frame structure 11, a pair of assembling disks 16 are positioned against opposite sides of the central portions of this sound reproducing assembly or unit and are formed with central openings to receive the axis rod 9 to which the entire unit, is rigidly secured by the securing uo l ' duction.

means indicated at 17, locking' `the assembling disks, the frame, and plate member 15 in rigid assembled relation on the axis rod. This completes the construction of the sound reproducing structure of the loud speaker unit which is mounted on the single support through' the plate 7 carrying the vibratory section 5 so that the sound reproducing assembly is freely movable with the vibratory section.

In this way, a full floatingv sound reproducing assembly is provided which is carried by the vibratory armature section- -5 which directly moves the entire air column with the movement of the reproducing plate member 15, for setting up the sound waves. Due to the full floating movement ofthe reproducinfr assembly, the sound waves produced wi l be uniform throughout the entire area due to the fact that the plate member 15 will reciprocate or vibrate uniformly throughout its entire area through the association and construction of the frame assembly 10. l

By th's construction of the reproducing assembly being supported with the single` support which carries the armature and the vibratory section thereof, it will be seen that the vibratory section and re roducingplate operate in unison which eliminates the transmission of mechanical noise or the production of rattling causing the .reproduction of undesirable sound with the sound repro- An operating unit is mounted in the housing 2 for operating the full floating sound reproducingmechanism andincludes a casing 18 slidably mounted within the housing and preferably formed' of suitable nonmagnetic metal. The pole pieces of the magnet structure are indicated at 19 having the separate terminals 20 lof angular formation as shown in Fi 4, removabl assembled therewith throug the means of 'lt andnut connections 21 which secure the pieces 19 together` with the terminal pieces 20 in assembled relation in the back of the casing 18,

as shown clearly in Fig. 4. IThese screw members also secure angle brackets 22. to the rear face of thel casing 18 which are formed with openings rotatably reciving the.

operating rod 23 having the eccentric i tion 24 mounted in openings in the brac ets 22 and the opposite ends rotatably mounted in the housing 2.- One end of this member 23 extends outwardly beyond the housing and is provided with-a handle section 25 so that the casing 18 may be suitably moved within the housing 2 in order to vary the distance between the ends of the terminal pieces 20 and the vibratoi'y section 5 of the armature. These terminal pole pieces 20 receive and mount the electro-magnet windings 26 which are adapted to lbe electrically connected in circuit ywith a radio receiving set in a manner well known in the art, or with other sound and transmitting and reproducing apparatus for operating the vibratory section of the armature in the energization 4of the electro-magnet for varying the with e ual amplitude over the entire surface. This will result in a much greater volume of sound togetherV with a substantially perfectv tone qua ity.

It results l having an equal vibrating amplitude, that all overtones and undertones are properly reproduced resulting in a most .natural sound reproduction. There is no distortion. in view of the size of the producing unit for the plate member in .l order to cause the entire structure to vibrate from this full floating structure which moves a substantially large column of air without requiring theL use of a horn. This construction in providing a full fioating mountingfor the sound reproducing structure with the framework for distributing the stress equallycver the surface of the diaphragm from the axis pin during vibration and sound reproduction, incorporates a new principle in this Afull floating-reproducing structure which is a departure over the prior art and is adapted to more eiliciently and accurately reproduce soun waves in the manner as above stated. Having thus described my invention, what I claim as new isz- A sound reproducing unit, comprising-a 'l housing, a sound reproducing structure having a full floating mounting on said housing, a casin slidable in said housing, electromagnetic means mounted in the casing operably associated with the sound reproducing structure. adapted to 'o rate said structure for reproducing soun waves, and a rod member rotatably mounted in the lhousing and having an eccentric connection with said casing operable to -slide the casing in the housin 1n the rotation thereof for varyin I the vo ume d In testimony whereof I aix my signature.

of sound reproduction 'of sai PETER AMATO.' l 

